The best replacement for d ring is o ring.

The best alternatives to d ring are rated as following:
★★★★★  o ring
★★★  full cheek
★★  shackle
★★  full cheek snaffle
★★  tow hook
★  eggbutt

Your alternative for d ring is not listed? Suggest!
Speaking about d ring, one probably shouldn't forget about strap.

Other search terms related to d ring and their ratings are:
★★★★★ strap
You have in mind a companion for d ring and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of d ring in all years. Click on graph for more.
d ring
o ring
full cheek